So I've been having a nitrate problem, and I want use some purigen to get rid of it. What I'm planning to do is buying a small 20ml packet of purigen on Ebay and them pouting that into my sponge filter's tube and then plugging it with some filter floss.

I use either Chemi-pure, purigen or polyfilter pads on different tanks .

Either way I think for a sponge filter , A polyfilter pad might be what you are looking for . I have found that current does NOT have to go through it , in order for it to work but there has to be some water circulation in the immediate area and sponge will work.

You just cut the pad into small pieces and change when it turns dark brown .

Get rid of the sponge filter and use the Azoo nano HOB. It's the same thing as the Red Sea deco art nano filter (now discontinued). I use this on a 2.5 gallon and it works great, absolutely tiny and the water flow is adjustable. Besides you can buy yourself a purigen packet, cut it to size, then staple it shut. I believe most staples are stainless steel, so it wont harm your water.

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